p1000 and p1647
#1
02-04-2013, 08:32 PM
p1000 and p1647
I've had a p0442 show up on the DTCs. Figured I'd try a little oil around the fuel cap seal, clear the codes and check it again. Sure enough, plugged in scanner, started car and no P0442. What I did get was a P1000 and P1647. I know P1000 means system check did not complete and that P1647 is O2 sensor chip(bank 2..I think). I recently had the A drum replaced in the tranny. Would a O2 sensor being bad, or a wiring problem to the sensor keep the system check from completing?
#2
02-05-2013, 10:16 AM
Senior Member
If the system check is completed & no faults are flagged up, then it will change from P1000 to P1111.
P1647 is actually failure of the heater element inside the upstream O2 sensor on the LH engine bank. These sensors are actually 'linear air/fuel ratio sensors' & because of the way they work, they require a powerful heater-which is more prone to burning out with high mileage.
There's nothing you can do except replace the sensor-I had exactly the same fault on my 2001 XJR a couple of years ago. The heater element usually fails on start-up, because it's switched on fully by the ECU to warm the O2 sensor up quickly.
The heater element usually draws around 6 amps & the current is controlled by the ECU, which reduces the average current as the engine & heater warm up-it's controlled in a digital manner by switching the heater supply on & off at varying intervals.
To remove the O2 sensor, you'll need to remove the coolant expansion tank at the bulkhead with the windscreen to make space to work in below. It's a pig to remove so allow a morning for the job. P1647 means the sensor on the LH bank under the coolant expansion tank & P1646 is the sensor on the RH bank which is much easier to remove. They are the upstream sensors at the top of the catalysts.
In most cases it's usually P1647 which comes up first & is the harder sensor to reach-it's possible it runs hotter in the more confined space. The other sensor is much easier to reach & doesn't fail as often-my guess is that it runs cooler as there's more free air around it...
Anyway, if you don't replace the O2 sensor, the ECU will go into 'basic' fuelling mode without the fine mixture adjustments from the O2 sensor information-so power will be down & fuel consumption will increase by around 15% or so.
New upstream Denso sensors are not cheap, but if you're on a budget & just need to get the car running again, you can use the upstream grey plug sensors from the 2001 onwards V6 model X-Type Jags. There are plenty of used ones on ebay for low prices...
P1647 is actually failure of the heater element inside the upstream O2 sensor on the LH engine bank. These sensors are actually 'linear air/fuel ratio sensors' & because of the way they work, they require a powerful heater-which is more prone to burning out with high mileage.
There's nothing you can do except replace the sensor-I had exactly the same fault on my 2001 XJR a couple of years ago. The heater element usually fails on start-up, because it's switched on fully by the ECU to warm the O2 sensor up quickly.
The heater element usually draws around 6 amps & the current is controlled by the ECU, which reduces the average current as the engine & heater warm up-it's controlled in a digital manner by switching the heater supply on & off at varying intervals.
To remove the O2 sensor, you'll need to remove the coolant expansion tank at the bulkhead with the windscreen to make space to work in below. It's a pig to remove so allow a morning for the job. P1647 means the sensor on the LH bank under the coolant expansion tank & P1646 is the sensor on the RH bank which is much easier to remove. They are the upstream sensors at the top of the catalysts.
In most cases it's usually P1647 which comes up first & is the harder sensor to reach-it's possible it runs hotter in the more confined space. The other sensor is much easier to reach & doesn't fail as often-my guess is that it runs cooler as there's more free air around it...
Anyway, if you don't replace the O2 sensor, the ECU will go into 'basic' fuelling mode without the fine mixture adjustments from the O2 sensor information-so power will be down & fuel consumption will increase by around 15% or so.
New upstream Denso sensors are not cheap, but if you're on a budget & just need to get the car running again, you can use the upstream grey plug sensors from the 2001 onwards V6 model X-Type Jags. There are plenty of used ones on ebay for low prices...
The following 4 users liked this post by Red October:
#3
02-13-2013, 08:13 PM
Ok, well guess I'll be swapping the O2 sensor this weekend. New one arrived today.....$200 and some change from Motorcars Ltd. About $10 more than that for the new headlight lens.......that one hurt my feelings..lol. All I need is a dang 6" round piece of glass....oh well. Got another project for the weekend.
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